Hey @cschmelzer… This is a great question, and @Annarose.Peterson is absolutely correct; the Extended Enterprise (aka: multidomain) application can allow for this simply because you can give your users a different login flow.
In this case, it would start with a separate URL (which could be customized of course), and on each domain you could have different branding a look, registration options, and more. I have a couple of examples of different external catalog pages:
Perhaps some other clients have some more examples of the business side, but in my experience, a great option is to include some demo content (course advanced properties - catalogs tab) for these external users to consume before the purchase.
We’ve also got a DoceboU course available if you’d like to see more.
Hope this helps! :)